JPH0745218A - Plane type image display device - Google Patents

Abstract

PURPOSE:To obtain a normal image on the whole image plane by arranging mutually opposing conductive plates of a horizontal deflecting electrode outside of an effective electron beam passing area, and radiating electron beams only on a small division of a prescribed image in the vicinity of the image screen. CONSTITUTION:Strip paper-like conductive plates 16A and 16B are arranged opposite in the vertical direction on the same plane in the middle of a row of a through-hole 14 of a focusing electrode 5, and respective branch parts 23A and 23B of the conductive plates 16A and 16B to constitute a pair of horizontal deflecting electrodes 6 are arrange opposite to each other, and prescribed different voltages are impressed on the respective conductive plates, and electron beams are deflected horizontally. An opposing branch part pair 24 in a branch part 23 is arranged outside of an effective electron beam passing area. Thereby, since a locus up to a screen from a line electrode can be made to coincide with each other in the electron beam of a unit in a central part of an image screen and the electron beam a unit in a peripheral part of the image screen, overlapping radiation of the electron beams of the adjacent units or a clearance are not caused, so that a normal image can be obtained on the whole image plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat image display device for video equipment.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube has been mainly used as a display element for displaying a color television image.
Since the conventional cathode ray tube has a wider depth than the screen,
It was impossible to make a thin television receiver. In addition, EL display elements, plasma display devices, liquid crystal display elements, and the like have recently been developed as flat plate display elements, but they are all insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display. .

Therefore, as a means for achieving a flat display device by using an electron beam, a new display device has been proposed in Japanese Patent Application Laid-Open No. 1-130453 (Japanese Patent Application No. 62-288762).

This is to divide the screen on the screen into a plurality of sections in the vertical direction, deflect the electron beam in the vertical direction for each section to display a plurality of lines, and further divide the section in the horizontal direction into a plurality of sections. The R (red), G (green), and B (blue) phosphors are made to sequentially emit light for each section (hereinafter referred to as image subsection), and the R, G, and B phosphors The television image is displayed as a whole by controlling the irradiation amount of the electron beam by a color video signal.

FIG. 10 is an exploded perspective view showing a part of a conventional image display device. In FIG. 10, 1 is a back electrode, 2
A, 2b and 2c are a line cathode as an electron beam source, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 is a focusing electrode, and 6
Is a horizontal deflection electrode, and 7a and 7b are vertical deflection electrodes. These components are housed in a front container 8 and a back container 9 made of glass or the like, and the interior of the container is evacuated to display an image. The device has achieved.

The back electrode 1 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathodes 2a to 2c.

The line cathodes 2a to 2c are horizontally stretched so as to generate an electron flow having a substantially uniform current density distribution in the horizontal direction, and a plurality of ( In this conventional example, only three lines 2a, 2b and 2c are shown.)
It is provided. These line cathodes 2a to 2c are formed, for example, by coating an oxide cathode material on the surface of a tungsten wire.

The electron beam extraction electrode 3 is made of a conductive plate 11 and faces the back electrode 1 through the line cathodes 2a to 2c,
Rows of through holes 10 provided at appropriate intervals in the horizontal direction are provided on a horizontal line facing each line cathode. The electron flow generated by the line cathodes 2a to 2c due to the potential difference between the back electrode 1 and the electron beam extraction electrode 3 is extracted in the forward direction to form an electron beam.

The signal electrode 4 is composed of a row of vertically elongated conductive plates 12 which are arranged at predetermined positions at opposite horizontal positions of the through holes 10 in the electron beam extraction electrode 3. , In each conductive plate 12,
A similar through hole 13 is provided at a position facing the through hole 10 of the extraction electrode 3. Further, the electron beam is irradiated to the position of the phosphor of a predetermined color and deflected so as to generate a predetermined brightness by a video signal inputted from the outside.

The focusing electrode 5 has a conductive plate 15 having a through hole 14 at a position facing the through hole 13 of the signal electrode 4.
The electron beam is focused so as to form a predetermined spot on the phosphor.

The horizontal deflection electrode 6 has a through hole 1 for the focusing electrode 5.
The strip-shaped conductive plates 16a and 16b are arranged in the vertical direction on the same plane so as to face the middle of the row of four and form a pair of horizontal deflection electrodes 6, for example, as shown in FIG.
The strip-shaped conductive plates 16 as shown in FIG. 13 are arranged so as to face each other and are formed in a comb shape as a whole, and in the comb-shaped conductive plates as shown in FIG. Branches are formed so as to face each other, the branches are arranged to face each other, and a predetermined voltage is applied to the conductive plates arranged to face each other, whereby the electron beam is horizontally deflected.

The vertical deflection electrode 7 is a through hole 1 of the focusing electrode 5.
The strip-shaped conductive plates 18a and 18b are arranged in the horizontal direction on the same plane so as to face the middle of the four rows to form a pair of vertical deflection electrodes 7. For example, FIG.
In the configuration, two comb-shaped conductive plates are intermeshed with each other on the same plane with an appropriate gap.

The screen 19 has R (red), G (green), and B (blue) phosphors 2 which emit light when irradiated with an electron beam.
0 is applied to the inner surface of the glass container 8 and a metal back layer (not shown) is added to the inner surface of the glass container 8.

In the above image display device, when the electrodes are processed and assembled, the electrodes are processed and positioned with high accuracy so that the seams of the adjacent image subsections 21 can be seen uniformly by the viewer. I have acquired a high quality image.

The electron beam 17 is emitted from the linear cathode 2, passes through through holes 10, 13 and 14 provided in the electron beam extraction electrode 3, the signal electrode 4 and the focusing electrode 5, respectively, and the horizontal deflection electrode 6 is formed. And, the screen 19 is irradiated via the vertical deflection electrode 7.

Further, as shown in FIG.
Is irradiated with an electron beam to cause the phosphor 20 to emit light, and a screen effective area where an image is actually displayed, and a non-screen effective area where a screen is not actually displayed at the periphery of the screen 19 (shaded lines in FIG. 11). Part) exists. The effective electron beam passage region is a region in which there is a hole through which an electron beam passes in an electrode for displaying an image in the image subsection 21 in the effective region of the screen, and the effective electron beam passage region passes through the boundary of this region. It is called the boundary of the region (α-α line in FIG. 11).

Further, a back electrode, a line cathode, an extraction electrode, a signal electrode, a focusing electrode, which correspond to one image subsection 21,
A set of the horizontal deflection electrode, the vertical deflection electrode and the screen plate will be referred to as a unit.

In the flat-panel image display device having the above-described structure, since the electron beam is not required in the non-screen effective area, the conductive plates facing each other of the horizontal deflection electrodes, the conductive plates facing each other of the vertical deflection electrodes, and the focusing are provided. The through hole of the electrode was not provided outside the effective electron beam passage area.

[0019]

However, in the conventional structure as described above, the industry distribution of each electrode of the unit located in the central portion of the image and the electric field distribution of each electrode of the unit located in the peripheral portion of the image are different. It has a different distribution. In other words, the shapes of the equipotential surfaces of the central part of the screen and the peripheral part of the screen are different. Further, as shown in FIG. 12, the inner surface shape of the front container also disturbs the electric field distribution in the peripheral portion of the screen due to the presence of the exhaust pipe portion, the high voltage terminal, the fixing screw, the outer shape of the surface electrode unit, the external lead terminal and the like.

For example, when a conductive plate facing the horizontal deflection electrode as shown in FIG. 13 is provided only in the effective electron beam passage region, the equipotential surface has a shape as shown in FIG. That is, the boundary of the effective electron beam passage region has a shape of the equipotential surface different from the center of the screen. Due to the nonuniformity of the equipotential surface, the loci from the line electrode to the screen of the electron beam of the unit in the central portion of the screen and the electron beam of the unit in the peripheral portion of the screen become different as shown in FIG. In the peripheral area of the screen, the electron beams of adjacent units overlap and irradiate the screen, resulting in a brighter part than the surroundings, or a part not illuminating the screen, resulting in a darker part than the surroundings. No image can be obtained.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an electron beam irradiates only a predetermined image subsection in the peripheral portion of the screen to obtain a normal image on the entire screen. Is.

[0022]

In order to solve the above-mentioned problems, the present invention provides a back electrode, a line cathode as an electron beam source, and a drawer in a flat glass bulb vacuum from the rear to the front of the screen. Electrodes, signal electrodes, focusing electrodes, horizontal deflection electrodes provided with strip-shaped conductive plates facing each other,
In the flat-panel display device in which the vertical deflection electrodes and the screen plate are arranged and housed, the conductive plates facing the horizontal deflection electrodes are provided outside the effective electron beam passage region.

[0023]

With the above configuration, the electric field distribution in the central portion of the screen and the peripheral portion of the screen are uniform, and the equipotential surfaces are also uniform, so that a normal image can be obtained on the entire screen.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals are used for the same configurations as those of the conventional example.

(Embodiment 1) In FIG. 1, the horizontal deflection electrode 6 is a strip-shaped conductive plate 16a in the vertical direction on the same plane so as to face the middle of the row of the through holes 14 of the focusing electrode 5.
6B are arranged to form a pair of horizontal deflection electrodes 6. In the comb-shaped conductive plates 16a and 16b, the branch portions 23 are arranged so as to face both sides of each trunk portion 22 in the longitudinal direction.
Is formed. A branch portion 23 of the one conductive plate 16
B is arranged so as to face the branch portions 23b of the other conductive plates 16b, and the electron beam is horizontally deflected by applying a predetermined different voltage to each of the conductive plates 16a and 16b.

The pair of branch portions 24, which is a set of the branch portions 23 that resist, is also provided outside the effective electron beam passage region.

With such a structure, as shown in FIG. 2, in the effective electron beam passage region, a similar electric field distribution is repeated in the branch pair for each unit,
Since the equipotential surface also repeats the same for each pair of branches for each unit, as shown in FIG. 3, the locus from the line electrode to the screen by the electron beam of the unit in the center of the screen and the electron beam of the unit in the peripheral part of the screen. Does not have a different trajectory.

In FIG. 1, a pair of branch portions 2 having the same shape is used.
Although 4 is provided outside the effective electron beam passage region, even if the branch pairs 24 having different shapes are provided outside the effective electron beam passage region, the electric field distribution for each unit has the same shape in the effective electron beam passage region. As a result, the same effect can be obtained.

(Embodiment 2) In FIG. 4, the vertical deflection electrode 7 is a strip-shaped conductive plate 18 a in the horizontal direction on the same plane so as to face the middle of the row of the through holes 14 of the focusing electrode 5.
8B are arranged to form a pair of vertical deflection electrodes 7, and two comb-shaped conductive plates 18a and 18b are intermeshed with each other on the same plane at appropriate intervals. .

The opposing conductive plates 18a and 18b are also provided outside the effective electron beam passage area.

With such a structure, as shown in FIG. 5, the same electric field distribution is repeated in the conductive plate of each unit in the effective electron beam passage region, and the equipotential surface is also the conductive plate of each unit. Since the same procedure is repeated, the trajectories from the line electrodes to the screen do not differ between the electron beam of the unit in the central portion of the screen and the electron beam of the units in the peripheral portion of the screen as shown in FIG.

In FIG. 4, conductive plates 18a and 18b are extended in the horizontal direction, and conductive plates are further provided in the vertical direction so that the conductive plates opposed to each other are formed into the effective electron beam passage region. However, the conductive plate outside the effective electron beam region is the conductive plate 18 inside the effective electron beam region.
Even if the shape is different from B and 18B, the same effect can be obtained by making the electric field distribution the same.

Example 3 In FIG. 7, the focusing electrode 5
At the positions facing the through holes 13 of the signal electrode 4,
It is composed of a conductive plate 15 having a through hole 14.

The through holes 14 are also provided outside the effective electron beam passage area. With such a configuration, as shown in FIG. 8, a similar electric field distribution is repeated in the through holes of each unit in the effective electron beam passage region, and the equipotential surface is also repeated in the same for the through holes of each unit. Therefore, as shown in FIG. 9, the trajectories from the line electrodes to the screen do not differ between the electron beam of the unit in the central portion of the screen and the electron beam of the unit in the peripheral portion of the screen.

In FIG. 7, a through hole having the same shape as the through hole 14 in the electron beam passage area of the same shape is provided outside the effective electron beam passage area, but the through hole outside the effective electron beam area is effective. Even if the through hole 14 in the electron beam region has a different shape, the electric field distribution has the same shape,
The same effect can be obtained.

[0036]

As described above, according to the present invention, each unit of the vertical deflection electrode, the horizontal deflection electrode, and the focusing electrode in the effective electron beam passage region is operated by the unit during operation of the flat panel image display device. Since the same electric field distribution is repeated and the equipotential surface also repeats the uniform shape, the trajectory from the line electrode to the screen is different between the electron beam of the unit in the center of the screen and the electron beam of the unit in the peripheral area of the screen. Therefore, it is possible to obtain a normal screen without overlapping and irradiating the electron beams of the adjacent units or irradiating with a gap.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a horizontal deflection electrode according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the same AA.

[Figure 3] Enlarged view of the same instep

FIG. 4 is an enlarged view of a main part of a vertical deflection electrode according to an embodiment of the present invention.

FIG. 5 is a sectional view of a main part of the same BB.

[Figure 6] Enlarged view of Otobe

FIG. 7 is an enlarged view of a main part of a focusing electrode according to an embodiment of the present invention.

FIG. 8 is a sectional view of the main part of the same CC.

FIG. 9 is an enlarged view of the same part.

FIG. 10 is an exploded perspective view of a conventional flat image display device.

FIG. 11 is a block diagram of a screen of a flat image display device.

FIG. 12 is an external view of a flat image display device.

FIG. 13 is a sectional view of the same DD.

FIG. 14 is an enlarged view of a main part of a conventional horizontal deflection electrode.

FIG. 15 is a sectional view of the main part of the same EE.

FIG. 16 is an enlarged view of the same section.

FIG. 17 is an enlarged view of a peripheral portion of a conventional screen.

[Explanation of symbols]

 5 Focusing Electrodes 6 Horizontal Deflection Electrodes 7 Vertical Deflection Electrodes 14 Through Holes 15, 16, 18 Conductive Plates 17 Electron Beams 22 Stems 23 Branches 24 Branch Pairs

Claims (3)

[Claims] 1. A line cathode as an electron beam source and a plurality of electrode plates are provided between a back electrode and a screen, these electrodes are laminated and sealed in a flat glass container, and then the inside is evacuated. In a flat type image display device that draws out an effective electron boom from the wire cathode and controls it to display an image on the screen, a conductive plate that constitutes a horizontal deflection electrode of the electrode plate is used as an effective electron beam passage region. A flat image display device characterized by being provided in addition to the above. 2. A line cathode as an electron beam source and a plurality of electrode plates are provided between the back electrode and the screen, these electrodes are stacked and sealed in a flat glass container, and then the inside is evacuated. In a flat image display device for extracting an effective electron beam from the linear cathode and controlling it to display an image on the screen, an effective electron beam passes through a conductive plate that constitutes a vertical deflection electrode of the electrode plates. A flat image display device characterized by being provided in a region other than the area. 3. A line cathode as an electron beam source and a plurality of electrode plates are provided between the back electrode and the screen, these electrodes are laminated and sealed in a flat glass container, and then the inside is evacuated. In a flat image display device for extracting an effective electron beam from the linear cathode and controlling it to display an image on the screen, in the electrode plate, the through hole of the focusing electrode is outside the effective electron beam passage region. A flat-panel image display device, which is also provided.